Treaty Series No. 27 (1972). Multilateral agreement relating to the collection of route charges signed at Brussels on 8 September 1970 by the states parties to the "Eurocontrol" international convention relating to co-operation for the safety of air navigation [electronic resource].
- Cambridge [eng.] : Proquest LLC, 2007.
- Government document
1 online resource (16 p.: ).
- [1971-72] ; Cmnd. 4916
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